• Q HDMI 2.1 - Ultra High Speed HDMI Cable


    Q: What is an Ultra High Speed HDMI Cable?
    A: The Ultra High Speed HDMI Cable is the first cable defined by the HDMI Forum. Ultra High Speed HDMI Cables comply with stringent specifications designed to ensure support for high resolution video modes such as 4Kp50/60/100/120 and 8Kp50/60 as well as new features such as eARC and VRR. Ultra High Speed HDMI Cables exceed the requirements of the latest international EMI standards to significantly reduce the probability of interference with wireless services such as Wi-Fi.

    Q: Is the Ultra High Speed HDMI Cable a Category 3 cable?
    A: Yes

    Q: Is this cable required for delivering HDMI 2.1 Specification features?
    A: The cable is the best way to ensure that high-bandwidth dependent features are delivered including the enhanced video and audio performance, and accounting for the new EMI characteristics

    Q: What cable(s) do I need to make use of the eARC feature?
    A: Ultra High Speed HDMI Cables are designed to support the new eARC feature in addition to the highest resolution video modes. The Standard HDMI Cable with Ethernet and the High Speed HDMI Cable with Ethernet will also support eARC.

    Q: When will I be able to purchase an Ultra High Speed HDMI Cable?
    A: Schedules for the availability of Ultra High Speed HDMI Cables are determined by the manufacturers of the cables. Manufacturers will be able to ship these cables once the HDMI 2.1 Compliance Test Specification (CTS) is available and a cable has passed compliance testing. The HDMI Forum is actively working on development of these tests and expects them to be available in 1H 2018.

    Q: Will existing HDMI High Speed Cables deliver the HDMI 2.1 features also?
    A: Existing HDMI High Speed Cables with Ethernet can only deliver some of the new features, and the new Ultra High Speed HDMI Cable is the best way to connect HDMI 2.1 enabled devices to ensure delivery of all the features.

    Q: What connectors does the Ultra High Speed HDMI Cable use?
    A: It is compatible with HDMI connectors Types A, C and D.

    Q: Does the Ultra High Speed HDMI Cable have an Ethernet channel?
    A: Yes, it supports the HDMI Ethernet Channel.

    Q: Can the Ultra High Speed HDMI Cable work with existing HDMI devices?
    A: The cable is backwards compatible and can be used with all existing HDMI devices.

    Q: What is the maximum length of this cable?
    A: The specification does not indicate a cable length. Cable length depends on the cable manufacturer. It is likely the maximum lengths for passive cables will be approximately 2 to 3 meters.

    Q: Are active cables supported in the specification?
    A: The specification permits wire, passive, active, and converter Category 3 cable assemblies.

    Q: Will these cables require a new cable name logo for their packaging?
    A: Yes, they have an official Cable Name Logo design and colors, requirements for on-cable printing and cable name translations. Details are available in the Adopted Trademark and Logo Usage Guideline (ATLUG) on the HDMI.org website. 

  • Q HDMI 2.1 - Enhanced Refresh Rate Features


    Q: Are these primary for gaming applications?
    A: Certain aspects are better suited for gaming, but it depends on how the manufacturers implement the features. For example, for better gaming, Variable Refresh Rate (VRR) that synchs up source and display with continually changing refresh rate, and Quick Frame Transport (QFT) that allows frames to transmit faster from the source, both allow for smoother, no-lag, and no screen tearing gaming experiences.

    Q: How is video or movie viewing any better?
    A: When you switch between sources and their content sometimes there is a lag or dead screen while devices change resolutions, refresh rates or TV viewing modes; but Quick Media Switching (QMS) switches and sets those automatically and very quickly so viewing is uninterrupted and smooth.

    Q: Can products have a combination of these features?
    A: Yes, but it depends on each manufacturer’s implementation, so it is necessary to carefully check their specifications and marketing materials.

    Q: Are these features backwards compatible or do all the components have to be HDMI 2.1 enabled?
    A: The devices have to be 2.1 enabled and also have the same feature capabilities enabled on both the source and display. 

  • Q HDMI 2.1 - eARC


    Q: Will this work with any HDMI cable?
    A: This works with HDMI High Speed Cables with Ethernet and the new Ultra High Speed HDMI Cable.

    Q: Is eARC available through a firmware upgrade?
    A: Generally speaking, no. Check with the manufacturer of your product to confirm.

    Q: What audio formats are supported?
    A: The latest high-bitrate audio formats are supported including DTS Master, DTS:X, Dolby TrueHD, Dolby Atmos and more.

    Q: Will the existing ARC-enabled products work with new products that use eARC?
    A: Maybe. Manufacturers can produce products that are compatible with both eARC and ARC. However, eARC is not defined to be backwards compatible with ARC. 

  • Q HDMI 2.1 - Dynamic HDR


    Q: Does Dynamic HDR require the new Ultra High Speed HDMI Cable?
    A: No, but it will be necessary to enable 4K120 and 8K60 video with HDR due to the high bandwidth required by these resolutions and refresh rates.

    Q: Which HDR formats does the specification support?
    A: It supports various static and dynamic HDR solutions.

    Q: How does the specification support multiple HDR solutions?
    A: Static and Dynamic HDR-enabled devices that implement the HDMI 2.1 Specification transmit both Static and Dynamic HDR metadata over the HDMI interface in a standardized way; and also go through the same mandatory HDMI compliance testing to ensure they can properly send/receive Static and Dynamic HDR metadata over the HDMI interface regardless of product manufacturer. This ensures consumers can get all the benefits of Dynamic HDR without possible compatibility issues.

    Q: Is Dynamic HDR accessible via a firmware upgrade?
    A: Manufacturers may or may not be able to enable Dynamic HDR with a firmware upgrade. Contact the manufacturer of your product to see if this is possible. 

  • Q HDMI 2.1 - High Video Resolutions


    Q: Will 8K@60 or 4K@120 require a new cable?
    A: Yes, in order to ensure performance and compatibility the Ultra High Speed HDMI Cable is required.

    Q: What are the supported resolutions and frame rates?

    • 4K50/60
    • 4K100/120
    • 5K50/60
    • 5K100/120
    • 8K50/60
    • 8K100/120
    • 10K50/60
    • 10K100/120

    Q: Is compression used to achieve those resolutions and frame rates?
    A: The specification supports both uncompressed and compressed modes. Manufacturers can implement either or both modes. The designations are:

    • 4K120A – supports uncompressed mode
    • 4K120B – supports compressed mode
    • 4K120AB – supports both
    • 8K60A – supports uncompressed mode
    • 8K60B – supports compressed mode
    • 8K60AB – supports both

    Q: How do I identify which modes are supported in my products?
    A: Manufacturers may use the designations indicated above (e.g. 8K60A, 8K60B, 8K60AB) in their product marketing, advertising, user guides, packaging, website, and on-product.

    Q: What type of compression is supported?
    A: The specification incorporates VESA DSC 1.2a link compression, which is a visually lossless compression scheme. VESA DSC 1.2a also can be used to obtain higher resolutions than 8K60/4:2:0/10-bit color, such as 8K60 RGB, 8K120 and even 10K120. VESA DSC 1.2a also supports 4Kp50/60 with the benefit of enabling operation at much lower link rates.

    Q: What colorimetry is supported?
    A: HDMI 2.1 Specification supports the latest color spaces including BT.2020 with 10, 12, and 16 bits per color component.


    Q: What is FRL and is it necessary for the higher resolutions and faster refresh rates?
    A: FRL stands for Fixed Rate Link and it’s a signaling technology supported in the HDMI 2.1 Specification. FRL is necessary to achieve the higher uncompressed resolutions such as those above 4k60 as well as the ultra high speed bandwidths up to 48Gbps. It’s also required for compressed video transport which in turn enables operation at lower data rates for example 4k60 and ultra-high pixel rate video such as 10Kp120.


    Q: Does FRL replace TMDS?
    A: Yes, it replaces TMDS. Note that the HDMI 2.1 specification still requires support for TMDS for backwards compatibility and still seamlessly supports the billions of HDMI devices that utilize TMDS.


    Q: Can FRL be implemented through a firmware upgrade?
    A: Upgradeability needs to be designed into the silicon and that is up to the manufacturers, although implementing FRL is most likely going to require new hardware.

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